Answer:
Saltation
Step-by-step explanation:
The rolling and hopping motion of sediment particles on the stream bed caused by stream flow is called saltation. Saltation is a type of sediment transport that occurs when the force of the flowing water is strong enough to move individual particles along the stream bed. As the water flows, it creates a series of small, repeated impacts on the sediment particles, causing them to roll or hop along the stream bed. This process can help to move sediment downstream, as well as to shape and reshape the stream bed itself. Saltation is an important aspect of the hydrological cycle and can play a role in the erosion, deposition, and overall behavior of streams and rivers.